<template>
  <div>
    <ul>
      <li :style="{opacity}">欢迎学习Vue</li>
      <li>news001 <input type="text"></li>
      <li>news002 <input type="text"></li>
      <li>news003 <input type="text"></li>
    </ul>
  </div>
</template>

<script>
export default {
  // eslint-disable-next-line vue/multi-word-component-names
  name: "News",
  data() {
    return {
      a: false,
      opacity: 1
    }
  },
  // mounted() {
  //   console.log('mounted', this)
  //   this.timer = setInterval(() => {
  //     this.opacity -= 0.01
  //     if (this.opacity <= 0) {
  //       this.opacity = 1
  //     }
  //   }, 16)
  // },
  // beforeDestroy() {
  //   console.log('News组件即将被销毁了')
  //   clearInterval(this.timer)
  // }
  activated() {
    console.log('News组件被激活了')
    this.timer = setInterval(() => {
      console.log('@')
      this.opacity -= 0.01
      if (this.opacity <= 0) {
        this.opacity = 1
      }
    }, 16)
  },
  deactivated() {
    console.log('News组件失活了')
    clearInterval(this.timer)
  }
}
</script>